Base for a chair



FIG. 1 is a perspective view showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view of the base for a chair of FIG. 1 showing an alternate configuration using sliding foot pads on the bottom of the legs. 

The ornamental design for a base for a chair, as shown and described. 